Door-check.



W Inventor C. E. KINARD. DOOR CHECK. APPLICATION FILED NOV. 18, 1914.

1,131,71 1. Patented Mar.16,1915.

Attornevs THE NORRIS P'ETERS CO-. PHOm-LITHQ. WASHINGIUN. D. C.

CHESTER E. KINARID, OF COOPER, TEXAS.

DOOR-CHECK.

Specification of Letters Patent. v

Patented Mar. 15, 1915.

Application filed November 18, 1914. Serial No. 872,797.

To all whom it may concern Be it known that l, Crinsrnr. E. KINARD, a citizen of the United States, residing at Cooper, in the county of Delta and State of Texas, have invented a new and useful Door- Check, of which the following is a specification.

The present invention appertains to door checks, and aims to provide novel and improved means for controlling the movements of a door, or other oscillatory movable structure.

The object of the invention, is the provision of unique means for operatively connecting the cylinder and piston to the door and door casing or frame, whereby the desired results are carried out.

It is also within the scope of the invention, to provide a door check of the character specified, which will be comparatively simple, non-encumbering and inexpensive in construction, as well as being efiicient and thoroughly practical in its use.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in its preferred embodiment in the accompanying drawings, wherein Figure 1 is a plan view of the improved door check as applied, with the door in closed position. Fig. 2 is an elevation of the device, parts being shown in section,

with the door swung partially open to neutral position.

In carrying out the invention, there is provided a suitable bracket 1 having a base plate 2 adapted to be secured in any sultable manner to the lintel L or other suitable part of the door easing or frame, the bracket 1 being provided with a bearing or eye 3 at its free end. The bracket 1 is adapted to be secured to that side of the door casing or frame toward which the door swings open, so that the bracket projects perpendicularly or at an angle from the casing or frame above the door D, to enable the door to swing under the bracket when opening or closing.

Carried by the bracket 1, is an air cylinder 4 which has its inner or closed end provided wlth an apertured ear 5 engaged pivotally over a hook or pintle 6 carried by the base plate 2 of the bracket, whereby the cylinder 4 may swing in a horizontal plane above the bracket 1. A cap 7 is engaged over the free or open end of the cylinder 4, and the piston rod or stem 8 is slidable through the cap 7 the piston 9 being secured in any suitable manner upon the inner end of the piston rod or stem 8 to work Within the cylinder 4. A coiled wire extension spring 10 is disposed within the cylinder 4 between the piston 9 and cap 7, to yieldably force the piston 9 inwardly toward the pivotally mounted end of the cylinder. The outer or free end of the piston rod 8 is deliexed or bent downwardly as at 11, and pivotally engaged through a radial arm 12 secured upon a spindle 13 journaled through the bearing or eye 3. The arm 12 seats upon the bearing 3, and the free end of the piston rod 8 being engaged with the arm 12, will support the free end of the cylinder 4. When the piston 9 is at the end of its inward or rearward stroke, the arm 12 will project toward the cap 7 or free end of the cylinder, and the arm 12 is arranged to be swung from one side to the other around that side of the bearing 3 remote from the cylinder 4, in order that when the arm 12 is swung outwardly, it will pull the piston rod 8 out wardly or forwardly against the tension of the spring 10. The arm 12 is relatively short, and a relatively long arm 14 is secured to the lower end of the spindle 13, and has its free end curved or bent to one side, as at 15, the curved end 16 of a link 17 being pivoted to the curved end 15 of the lever arm 14. The other end of the link 17 is pivotally connected to the upper edge of the door I), by means of a plate or element 18 secured in any suitable manner to the upper edge portion of the door and provided with an upstanding pintle 19 over which the respective end of the link 17 is pivotally engaged. The adjacent ends of the arm 14 and link 17 being curved as at 15 and 16, respectively, and being pivoted together, will prevent the pivotal point from moving to dead center when the arm 14 and link 17 aline, as seen in Fig. 1. Therefore, when the door is swung open in the direction of the arrow in Fig. 1, the link 17 will swing the arm 14 properly.

When the door is closed, the parts will be in the position illustrated in Fig. 1, so that when the door is swung open in the direction of the arrow, the link 17 will swing the lever arm 14: counter clockwise as seen in the said figure. This will swing the arm 12, which forms with the arm 14:, an actuating lever for the piston 9, and as a result at the outward movement of the arm 12, the piston rod or stem 8 will be drawn or pulled outwardly against the tension of the spring 10. This will prevent the door from being slammed when swung open. When the door D is only swung partially open so as to fall short of a neutral or intermediate position approximately perpendicular with or at right angles to the door casing or frame, and as soon as the door is released, it will be swung slowly backward to closed position under the influence of the spring 10 which in acting against the piston 9 will swing the lever 12-14: back to the position illustrated in Fig. 1, and the arm 14c in being swung backwardly will swing the door therewith through the medium of the link 17. However, when the door is swung beyond the neutral or intermediate position to swing the arm 12 toward the other side, the door will be swung completely open away from the doorway under the influence of the spring 10.

As a means for controlling the return movement of the piston 9, the cylinder 4 is provided with a bypass 20 extending from its inner end to a point between its ends, as clearly seen in Fig. 2, and the by-pass 20 is provided with a branch or port 21 leading to the atmosphere, and which is controlled by a screw or needle valve 22. The screw or needle valve 22 may be adjusted to either close or open, more or less, the branch or port 21. Thus, by controlling the position of the needle valve 22, the escape of air from the chamber within the cylinder in rear of the piston 9, may be controlled to a nicety, whereby the velocity of the return motion of the piston may be regulated. Thus, when the valve 22 is completely opened, to enable the air to flow freely from the cylinder through the bypass 20 and branch 21, the piston 9 may return quickly under the influence of the spring 10, whereas when the valve 22 is partially or completely closed, the return motion of the piston will be slackened or retarded accordingly, and in this manner the return motion of the door to either closed or fully opened position may be adjusted as desired. The by-pass 20 is also useful in that it enables the door D when approaching its closed position, to shut quickly, to cause the spring pressed latch of the door look (not shown) to snap into thekeeper for latching the door. Thus, when the piston 9 is returning within the cylinder hand when it passes the outward end of the by-pass 20, the air in back of the piston will readily escape through the by-pass 20 into the chamber in front of the piston, so that the return movement of the piston will no longer be retarded, and whereby the complete tension of the spring 10 will be brought into force for quickly closing the door after it has been returned to a point adjacent the door casing or frame. It is thus provided, that even if the door is returned slowly to closed position, the same will be given a quick final movement to closed position, for properly swinging the door within the casing or frame, and latching the same, as might not be accomplished if the door were only allowed to return slowly to closed position.

From the foregoing, taken in connection with the drawing, it will no doubt be obvious to those versed in the art, that the present structure carries out the objects de sired, in a comparatively simple and eflective manner. Particular attention is directed to the fact, that when the door is swung to the opposite sides of a'neutral or intermediate position, it will be swung closed or completely open, under the influence of the spring 10, so that the door check will be useful for both closing the door and holding the same open as desired. In this connection, it will be understood, that ordinarily when the door is opened to admit of the passage of a person through the doorway, the door will not be swung beyond the neutral position, so that there will be no danger of the door being completely opened and held so, when a person opens the door to pass therethrough. The present device may also be readily applied to the door and door casing, or other relatively movable parts. The other advantages and capabilities of the present device are thought to be obvious without further comment.

It will be observed that the present device may be rendered inoperative, by simply lifting the cylinder 1 and the piston rod 8 out of engagement with the hook 6 of the bracket, and the arm 12, respectively, so that the door maybe swung open and closed in the usual manner.

hat is claimed is:

In a device of the character described, a bracket having a base plate and a bearing at its free end, a lever having relatively short and long arms and a spindle between the arms journaled through the said bearing, the short arm being disposed above and seating upon the bearing and the long arm being disposed below the bearing, a cylinder, the base plate and one end of the cylinder having interengaging portions to pivot the cylinder to the base plate above the body of In testimonv that I claim the foregoing the bracket, a piston Within the cylinder as my own, I have hereto aflixed my signa- 10 having a piston rod projecting from the free ture in the presence of tWo Witnesses. end of the cylinder, the piston rod and short CHESTER E KINARD 5 lever arm having interengaging portions pivoting them together, a link pivoted to Witnesses: the long lever arm, and means for pivotally ED HENDRICK, connecting the link with a door. M. J. THOMAS.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, 1).0. 

